<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
    <!-- 步骤条区域 -->
    <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
    </el-steps>
    

    <!-- 左边Tab栏区域 -->
    <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
     <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader
                        expand-tringger="hover"
                        v-model="addForm.goods_cat"
                        :options="catelist"
                        :props="cateProps"
                        @change="handleChange"></el-cascader>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <!-- 复选框组 -->
                 <el-checkbox-group v-model="item.attr_vals">
                    <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
            <!-- action  表示图片要上传到的后台API地址 -->
            <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj" :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
             <quill-editor v-model="addForm.goods_introduce"></quill-editor>
             <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
        </el-tab-pane>
     </el-tabs>
    </el-form>
    </el-card>
    

    <!-- 图片预览 -->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%"
        :before-close="handleClose">
        <img src="previewPath" alt="" class="previewImg">
    </el-dialog>

  </div>
</template>


<script>
import _ from 'lodash'
export default {
  data() {
    return {
        activeIndex: '0',
        // 添加商品的表单数据对象
        addForm: {
            goods_name: '',
            goods_price: 0,
            goods_weight: 0,
            goods_number: 0,
            // 商品所属的分类数组
            goods_cat: [],
            // 图片的数组
            pics: [],
            // 商品的详情描述
            goods_introduce: '',
            attrs:[]
        },
        addFormRules:{
            goods_name: [
                 { required: true, message: '请输入商品名称', trigger: 'blur' },
            ],
            goods_price: [
                { required: true, message: '请输入商品价格', trigger: 'blur' },
            ],
            goods_weight: [
                 { required: true, message: '请输入商品重量', trigger: 'blur' },
            ],
            goods_number: [
                { required: true, message: '请输入商品数量', trigger: 'blur' },
            ],
            goods_cat: [
                { required: true, message: '请选择商品分类', trigger: 'blur' },
            ]
        },
        // 商品分类列表
        catelist: [],
        cateProps: {
            label: 'cat_name',
            value: 'cat_id',
            children: 'children'
        },
        // 动态参数列表数据
        manyTableData: [],
        // 静态属性列表数据
        onlyTableData: [],
        // 上传图片的URL地址
        uploadURL: 'http://www.klxin.cn:8888/api/private/v1/upload',
        // 图片上传组件的headers 请求头像
        headerObj:{
            Authorization:window.sessionStorage.getItem('token')
        },
        previewPath: '',
        previewVisible: false
    }
  },
  created() {
      this.getCateList()
  },
  methods: {
    //   获取所有商品分类数据
      async getCateList() {
          const {data: res} = await this.$http.get('categories')
           

           if(res.meta.status !== 200) {
               return this.$message.error('获取商品分类数据失败')
           }

           this.catelist = res.data
           console.log(this.catelist);
           
      },
    //   级联选择器选中项变化， 会触发这个函数
      handleChange() {
          console.log(this.addForm.goods_cat);
        
          if(this.addForm.goods_cat.length !== 3){
              this.addForm.goods_cat = []
          }

          
      },
      beforeTabLeave(activeName, oldActiveName) {
          
          if(oldActiveName === '0' && this.addForm.goods_cat.length !==3) {
              this.$message.error('请选择商品分类')
              return false
          }
          
      },
      async tabClicked() {
        //   证明访问的是动态参数面板
        if(this.activeIndex === '1') {
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {
                params: {sel: 'many'}
                }
                )

            if(res.meta.status !== 200) {
                return this.$message.error('获取动态参数列表失败')
            }
            console.log(res.data);
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split('')
            })
            this.manyTableData = res.data
            
        }else if(this.activeIndex === '2') {
            const {data: res} =await this.$http.get(`categories/${this.cateId}/attributes`,
            {
                params: {sel: 'only'}
                }
                )
                if(res.meta.status !== 200) {
                    return this.$message.error('获取静态属性失败')
                }
                console.log(res.data);
                this.onlyTableData = res.data
        }
      },
    //   处理图片预览效果 
      handlePreview(file) {
          this.previewPath = file.response.data.url
          this.previewVisible = true
      },
    //   处理图片移除的操作
      handleRemove(file) {
        //   1.获取将要删除的图片的临时路劲
        const filePath = file.response.data.tmp_path
        // 2.从pics数组中，找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        // 3. 调用数组的 splice方法， 把图片信息对象， 从pics数组中移除
        this.addForm.pics.splice(i, 1)
      },
    //   监听图片上传成功的事件
    handleSuccess(response) {
        // 1.拼接得到一个图片信息对象
        const picInfo = {pic: response.data.tmp_path}
        // 2.将图片信息对象， push到pics数组中
        this.addForm.pics.push(picInfo)
    },
    handleClose() {},
    // 添加商品
    add() {
        this.$refs.addFormRef.validate(async valid => {
            if(!valid) {
                return this.$message.error('请填写必要的表单项')
            }
            // 执行添加的业务逻辑
            const form =  _.cloneDeep(this.addForm)
           form.goods_cat = form.goods_cat.join(',')
        //    处理动态参数
        this.manyTableData.forEach(item => {
            const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
            this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
            const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
            this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs

        // 发起请求添加商品
        // 商品的名称， 必须是唯一的
            const {data: res} = await this.$http.post('goods', form)

            if(res.meta.status !== 201) {
                return this.$message.error('添加商品失败')
            }
            this.$message.success('添加商品成功')
            this.$router.push('/goods')
        })
    }
     
  },
   computed: {
          cateId(){
              if (this.addForm.goods_cat.length === 3) {
                  return this.addForm.goods_cat[2]
              }

              return null
          }
      },
}
</script>


<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0  !important;
}

.previewImg{
    width: 100%;
}

.btnAdd{
    margin-top: 15px;
}
</style>